chall



Dec. 18, 1956 H. J. CHALL 2,774,536

CALCULATING MACHINE Filed June 13, 1955 4 Sheets-Sheet 1 3956 H. .5. CHALL 2,774,536

CALCULATING MACHINE Filed June 1-3, 1955 4 Sheets-Sheet 2 risk -2 Dec. 18, 1956 H. J. CHALL 2,774,536

CALCULATING MACHINE Filed June 13, 1955 4 Sheets-Sheet 3 Dee. 18, 11956 H. J. CHALL.

CALCULATING MACHINE 4 Sheets-Sheet 4 Filed June 13, 1955 United States Patent CALCULATING MACHINE Harold J. Chall, Castro Valley, Calif., assignor to Friden Calculating Machine Co., Inc., a corporation of fillifornia Application June 13, 1955, Serial No. 515,073

9 Claims. (Cl. 235-134) This invention relates to digital computers or calculating machines and more particularly to an accumulator mechanism which is an improvement on the accumulator mechanism described in my copending application S. N. 509,022, filed May 17, 1955, for Calculating Machine,

as a continuation-in-part of my application S. N. 215,064, 1

filed March 12, 1951, for Calculating Machine.

It is among the objects of the present invention to provide an improved accumulator mechanism of simplified construction and of extreme accuracy and operating efficiency which operates with a minimum amount of friction so as to maintain the load on the machine operating motor as low as possible; which operates the positive or additive side and the negative or subtractive side thereof in a completely balanced or symmetrical manner; which is of improved structural rigidity so that errors introduced by the displacement of parts and consequent binding of movable parts are eliminated; and which is easy to assemble and install and has a self-adjusting mounting for connection to the base of the associated machine.

Other objects and advantages will become apparent from a consideration of the following description and the appended claims in conjunction with the accompanying drawings wherein:

Fig. l is a side elevational view of the left-hand side of an adding machine accumulator illustrative of the invention, and of the tens-carry operating mechanism therefor;

Fig. 2 is a side elevational view of the left-hand side of the accumulator with the tens-carry operating mechanism omitted;

'Fig. 3 is a cross-sectional view of the accumulator taken on a plane parallel to and spaced to the right from the plane of the side elevation shown in Figs. 1 and 2;

Fig. 4 is a fragmentary front elevational view of the accumulator:

Fig. 5 is a cross-sectional view on the sectional plane represented by the line 5-5 of Fig. 3;

Fig. 6 is an elevational view of the left-hand ends of the tens-transfer restore hails of the accumulator; and,

Fig. 7 is a cross-sectional view on the line 77 of Fig. 6.

With continued reference to the drawings, the numeral 10 designates the base of the adding machine in which the accumulator of the present invention is incorporated and 11 indicates an opening in the base through which the accumulator may be installed in and removed from the associated machine.

The accumulator itself has a base 12 of rectangular shape and formed of a suitable material such as sheet aluminum which base is disposed below the machine base 10 in overlapping relationship to the opening 11 in the machine base and is secured to the machine :base by suitable fasteners, such as the screws 14. The accumulator base 12 is provided with an opening 15 of rectangular shape and includes apertured ears 16 upstanding, one

2,774,536 Patented Dec. 18, 1956 from each corner of the rectangular opening 15. The accumulator also has side plates 17 and 18 disposed in spaced apart and parallel relationship to each other and of irregular shape, and spacer plates 20 uniformly spaced apart between the side plates 17 and 18 in ordinal, parallel relationship, to each other, the separator plates having substantially the same irregular shape as the side plates 17 and 18. The side plates and separator plates are provided near their lower front corners with rectangular apertures 21 which are in registry with each other transversely of the accumulator and near their lower rear corners with rectangular apertures 22 which are also in registry, transversely of the accumulator. A rectangular supporting bar 25 extends through the apertures 21 and outwardly of the side plates 17 and 18 past the front upstanding ears 16 of the accumulator base and are rigidly secured -to these cars by screws 26. A rectangular bar 27 extends through the rear apertures 22 and past the rear, upstanding ears 16 of the accumulator frame and is secured to these cars -by the screws 30. A flanged frame 31, formed of a suitable material such as sheet aluminum, is disposed Within the opening 15 in the accumulator base 12 and is itself provided with an opening 32 of rectangular shape underlying the major portion of the bottom of the accumulator. The frame 31 is secured to the bars 25 and 27 by screws, as indicated at 35 and 36, which extend through apertures in the frame 31 at locations spaced apart along the bars 25 and 27, respectively, and are threaded int-o tapped holes in the bars to pull the bars downwardly toward the frame 31 and clamp the portions of the side and frame plates of the accumulator between the bottom edges of the apertures 21 and 22 and the bottom edges of the side and frame plates firmly between the bars 25 and 27 and the upper surface of the mounting frame 31. The mounting frame also has from and rear upstanding flanges 67 and 38 which engage the lower portions of the front and rear edges of the side and spacer plates of the accumulator assembly to hold these plates against longitudinal displacement relative to each other. A pair of spaced apart and parallel sleeves 40 and 41, extend through registering apertures in the spacer plates 20 and abut at their ends against the inner sides of the side plates 17 and 18 which side plates are provided with apertures registering with the bores of the sleeves 40 and 41. Bail shafts 42 and 45 extend through the sleeves 40 and 41, respectively, and through the corresponding apertures in the side plates for a purpose which will presently appear.

An accumulator gear shaft 46, disposed above and parallel to the shafts 42 and 45, extends through registering apertures in the spacer plates and both side plates of the accumulator and 20-to0th accumulator gears 47 are journalled on this shaft and disposed one between each two adjacent spacer plates and one between each of the side plates and the adjacent spacer plate, making a total of '11 such gears. Each of the gears 47 includes, beside the toothed gear portion thereof, a tubular hub '50 journalled on the shaft 46 and a diametrically extending tens-transfer cam 51 disposed against one side of the gear, the cam and gear both being apertured to receive the hub 50 which secures the cam and gear together and to itself to constitute the unit gea-r wheel assembly. The cam 51 is also provided with extrusions, as indicated at '52, which extend through apertures in the gear 47 located at opposite sides of and spaced from the hub '50 to maintain the cam in a preselected angular position relative to the associated gear.

The side plates '17 and 18 and the spacer plates 20 are provided with upwardly and rearwardly inclined extensions 55 and a drive gear shaft '56 extends through registering apertures in these extensions and is disposed above and parallel to the accumulator gear shaft 46.

Ten-toothed drive gears 57 are journalled on the shaft 55, one between each two adjacent spacer plates, and one between each side plate and the adjacent spacer plate, and mesh with the coordinal accumulator gears 47. Each drive gear has a cylindrical, tubular hub 60 journalled on the shaft 56 and a spacing washer 61 surrounds each drive gear hub 60 between the corresponding drive gear and one of the plates between which the drive gear is disposed.

The shafts '46 and 56 have their axes in a common plane which extends downwardly substantially midway between the shafts 4'2 and and these shafts have their axes in a common plane which is substantially perpendicular to the plane including the axes of the shafts 46 and 56.

A zdetent lever shaft 62 extends through registering apertures in the upper end portions of the plate extensions and detent levers 63 are rockably mounted each at one end on the shaft 62, there being one detent lever for each of the eleven ten-toothed drive gears 57. Each detent lever 63 carries at its free end a detent roller 65 engageable between adjacent teeth of the corresponding gear 57 and each lever is resiliently urged in a gear detenting direction by a tension spring 66 connected at one end to the corresponding lever, adjacent the free end of the lever and connected at its other end to a spring retaining plate 67 secured to the upper ends of the plate extensions 55.

The drive gears 57 are rotated by suitable additive and subtractive transmission gear assemblies, not illustrated in this application but 'fully'shown and described in my copending application S. N. 407,016, filed January 29, 1954, for Calculating Machine, and these gears in turn drive the accumulator gears 47 to enter values either a'dditively or subtractively into the accumulator.

The accumulator includes spring-powered, tens-carry or tens-transfer mechanism operative to carry tens in both addition and subtraction operations of the accumulator and the tens-transfer mechanism operated during addition operation of the accumulator includes a series of hellcrank levers, as generally indicated at 70, rockably mounted on the sleeve 40 and disposed one between each two adjacent separator plates 20 and one between each of the side plates 17 and 1% and the adjacent separator plate. Each transfer lever 70 comprises a bellcrank lever 71, having intermediate the length thereof a cylindrical hub 72 journalled on the sleeve 40 and having one leg extending forwardly and downwardly and its other leg 74 extending upwardly and forwardly and carrying at its distal end a cruciform live tip member 75 The downwardly and forwardly extending leg of the lever 72 is shaped to provide spaced apart spring hooks 76 and 77 and a tension spring 80 is connected between the book 76 and a spring hook 8]. provided by a forwardly projecting arm of the live tip 75. This spring 80 urges the live tip to rotate relative to the supporting hellcrank lever '71 until the distal end of a downwardly extending arm 82 of the live tip is stopped by a stop pin or stud 83 projecting laterally from the bellcrank arm 74 near the hub '72.

A spring 35, stronger than the spring 89, is connected between the spring hook 77 on the bellcrank 71 and a spring retaining plate 36 carried by forward extensions 87 of the side and spacer plates of the mechanism and urges the bellcrank 71 to rock about the shaft 42 in a counterclockwise direction as viewed in Fig. 3, to make a tenscarry when the bellcrank is freed to rock, as will be later explained.

The live tip 75 has an upwardly and rearward-1y extending arm 96) provided on its distal end with a gear tooth engaging shoe 51 which engages a tooth of the coordinal accumulator gear 4-7 and imports to the gear a unit rotation in an additive direction when the bellcrank 71 is rocked by the spring 85, as mentioned above. The pivoted, spring biased mounting of the live tip 75 on the bellcrank 71 permits the point or shoe 91 to be withdrawn from the gear 47 Without imparting any rotation in the opposite direction to the gear and the shoe is provided with a shoulder 94% which engages a fixed stop bar 95 extending through. registering apertures in the side and spacer plates between the gears 47 and the shafts 42 and 45 to limit the gear turning effort of the live tip '75 to a unit space rotational movement of the coordinal accumulator gear. The live tip 75 has a fourth arm 96 extending upwardly from the pivotal connection between the live tip and the bel'lcrank 71 and upwardly tapered near its distal end for engagement by a latch lever which holds the tens-transfer lever 7t? in its inoperative position and against rotational movement except when the latch is tripped by the tens-transfer cam 51 on its coordinal accumulator gear 2 7 when the accumulator gear has been turned through ten unit spaces from its 0" position.

A shaft 97 extends through the registering apertures in upwardly and forwardly directed extensions 1% of the side and spacer plates and is disposed above and substantially parallel to the shaft -75. A plurality of latch levers, generally indicated at Iltll, are rockably mounted at their upper ends on the shaft 97 and each comprises an arm M2 depending from the shaft and a cylindrical hub secured to the arm and receiving the shaft 97. At its lower end the arm 102 is provided with a laterally offset abutment formation ms Which'engages the upper end of the arm 96 of the corresponding live tip 75, the arms 96 being offset laterally in the space between the plate extensions E57 and 1170 so that the arm of a live tip mounted on a bellcrank lever 71 in one ordinal space of the accumulator, is engaged by a latch lever arm 102 mounted in the ordinal space next below that in which the bellcrank lever 71 is mounted. Thus, when a gear 47 moves ten spaces from its 0 position and trips its coordinal latch lever 101, this lever releases the tens-transfer lever 70 of the next higher order to impart a unit space rotation to the accumulator gear of the order next above the gear which tripped the tens-transfer latch thereby making the tens-carry from one order to the next higher order, as is well known to the art.

Each of the lever arms 1% is provided intermediate its length and on the inner edge thereof with an inwardly projecting nose formation 107 which engages a stop bar or tie rod itifi to limit inward swinging movement of the arm about the shaft 97 and a tension spring lit), connected between a spring hook lli'lll projecting outwardly from the outer edge of the arm 192 near the free end of this arm and a second tie rod 112, resiliently urges the latch lever to swing about the shaft 97 in a direction and to an extent to bring the nose formation MP7 against the stop bar 1278 and the abutment 1% into direct opposition to the upper end of the latch engaging arm 96 of the associated live tip 75.

A three-armed dive tip member, generally indicated at H4, is pivotally mounted on each latch lever arm 102 by a pivotal connection disposed adjacent the nose formation M57 and the live tip 11rd has a forwardly projecting arm constituting a spring hook 116 and an upwardly projecting stop arm 117 carrying a laterally projecting stud 120 disposed in an aperture 121 in the arm 102. A spring 122 connected between the spring arm 116 and an apertured car formation 17.4 on the arm 102 urges the live tip 114 to turn about the pivotal mountin-g 115 in a direction and to an extent to bring the stud 12 against the inner edge of the aperture 121 in the arm 192, as is shown in Fig. 3.

The live tip 13.4 also has a third arm 12,5 projecting in" wardly or rearwardly from the pivotal mounting 115 and carrying on its inner or distal end a cam formation 126 which overlaps the side of the coordinal gear 147 at which the associated tens-transfer cam 51 is disposed. When the gear 47 is turning in an additive direction, which is the clockwise direction as shown in Fig. 3, and turns ten unit spaces from its 0 position, one end of the tens-transfer cam 51 will engage the cam formation 126 and act through the live tip arm 125 to force the latch lever 191 outwardly about its pivotal mounting on the shaft 97 to remove the abutment formation 106 from the upper end of the arm 96 of the live tip 75, thereby freeing the tens-transfer lever 713 for rocking movement by its spring 85 to engage and rotate its coordinal gear which will be the gear of the order next above the gear carrying the cam which tripped the latch lever 101.

Each order of the negative or subtractive tens-transfer mechanism corresponds exactly to each order of the positive or additive transfer mechanism, as described above, and includes, in each order, a tens-transfer lever, generally indicated at 1313, which includes a bellcrank 131 having an aperture receiving the sleeve 45 and a hub 132 journalled on this sleeve, one leg providing spring hooks 134 and 135 and a second leg 136 disposed substantially at right angles to the spring hook leg and carrying at its distal end a pivotally mounted four-armed or cruciformed live tip 137 corresponding in all respects to the live tip 75. A tension spring 141'), connected between the spring hook 134 and the spring hook arm 141 extending downwardly from the pivotal mounting 142 be tween the live tip 137 and the bell crank arm 12 6, urges the live tip to turn in a counter-clockwise direction, as

viewed in Pig. 3, until the distal end portion of the live tip stop arm 145 is brought to bear against the stop stud 146, carried by the bellcrank 131. The gear actuating arm 147 projects upwardly from the pivotal mounting 142 and carries on its distal end a shoe or tip structure 148 which engages a tooth of the coordinal accumulator gear 47 to impart a unit space rotational movement to this gear when the tens-transfer lever 130 is rocked in a clockwise direction,, as viewed in Fig. 3. The shoe 148 has a shoulder 156) which engages the stop bar 95 to limit the accumulator gear rotating movement of the transfer lever to an extent such that the gear is turned through one unit space only for each tens-transfer movement of the gear. The live tip 137 also has a latch engaging arm 152 projecting upwardly and rearwardly from the pivotal mounting 142 and each order of the mechanism includes a latch lever, generally indicated at 153, pivotally mounted at its upper end on a shaft 154 which is parallel to the shaft 97 and disposed at the 0pposite side of the accumulator from the shaft 97, and an abutment formation 155 on its lower end engaging the upper or outer end of the live tip arm 152.

The latch lever 153 includes the lever arm 156 pivotally mounted at its upper end on the shaft 154 by hub 158 and carrying the abutment 155 on its lower end, and a live tip 160 pivotally mounted on the arm 156 by the pivotal connection 161 and having a rearwardly projecting arm 162, constituting a spring hook, an up wardly projecting arm 163 carrying a laterally projecting stud 164 received in an aperture 165 in the arm 156,

and a cam actuated arm 166 projecting inwardly or forwardly from the pivotal mounting 161 and carrying on its distal end a cam formation 167 which is engagable by one end of the coordinal cam 51 to trip the latch mechanism, as described above. The arm 156 is pro vided intermediate the length of its inner edge with an inwardly projecting nose formation 176, and a spring 171 connected between a spring hook 172 formed on the arm 156 near the lower end of this arm and a tie rod 175 extending transversely through the side and spacer plates of the accumulator, resiliently urges the arm 156 to a position in which the nose formation 170 bears against the tie rod or stop bar 176, this being the normal or latching position of the latch lever 153, as illustrated in Fig. 3.

The spring 171 holds the latch lever 153 in latching position until the coordinal accumulator gear 147 when rotating in a subtractive direction, which is the counterclockwise direction as viewed in Fig. 3, turns ten unit spaces from its 0 position and one end of the cam 51 engages the cam formation 167 on the live point arm 166 thereby forcing the latch lever to swing outwardly against the force of spring 171 and move the abutment formation away from the upper end of the latching arm 152 of the live point 137. A spring 180, connected between spring hook arm 162 and an apertured ear 181 on the latch lever arm 156, urges the live point to the position, as illustrated in Fig. 3, in which the stud 164 is against the inner side of the aperture in which position of the live point 160, the cam 51 will force the latch lever 153 outwardly under the conditions described above. If the gear is rotating in a positive or clockwise direction, however, as viewed in Fig. 3, when an end of the cam 51 engages the cam formation 167 on the live point arm 166, the live point will rock, expanding the spring to permit the end of cam 51 to pass the live point 160 without moving the latch lever 153 outwardly against the force of the spring 171.

A spring 182 is connected between the spring hook 135 on the bellcrank lever 131 and a spring retaining plate 184 carried by the lower edge portions of the side and spacer plates of the mechanism and acts, when the live point arm 152 is released from the latch lever 133, to rock the tens-transfer lever 130 in a direction to rotate the coordinal accumulator gear 47. While theoretically the springs 182 and 85 should be of substantially the same strength, it has been found advantageous to make the springs 182 somewhat stronger than the springs 85 since, when the springs 85 rock the corresponding tenstransfer levers 70 the effect of gravity on these levers acts in the same direction as the spring force whereas, when the springs 182 rock the negative tens-transfer levers 130, the effect of gravity on these levers is in opposition to the spring force. For similar reasons, it is advantageous to make the springs 171 on the negative side of the accumulator somewhat stronger than the corresponding springs 110 on the positive side.

Movements of the tens-transfer levers 70 and 130 are controlled by a pair of bails, each of which includes a cross-bar or rod as indicated at 185 and 186, of which the rod 185 is engageable with shoulder formations 187 on the inner edges of the bellcrank levers 70 and the rod 186 is engageable with similar shoulder formations 188 on the bellcrank levers 131 The rod 185 is mounted on the shaft 42 in spaced and parallel relationship to this shaft by a pair of bail legs, as indicated at 190 and 191, disposed one at each end of the rod 185. Each of the legs 199 and 191 is secured to a hub 192, pinned or otherwise rigidly secured on the corresponding end of the shaft 42, and the side plates 17 and 18 of the mechanism are provided with registering apertures, as indicated at 194, through which the rod 185 extends.

The bail rod 186 is mounted on the shaft 45 by the bail legs 195 and 196 disposed one at each end of the rod, and is held in spaced and parallel relationship to the shaft 45 by these legs. The bail legs 19% and 195 are provided on their adjacent edges with gear teeth series 197 and 198 which inter-mesh so that the legs 19%) and 195 rock simultaneously and to the same extent to move the rods 135 and 186 toward and away from each other and the bail legs 191 and 196 are provided with corresponding series of gear teeth 20%) and 201 which constrain these legs to also rock simultaneously and coextensively. It will be noted in Fig. 6 that the bail leg 1% is formed in two parts, 196 and 196, disposed in face to face relationship and, from Fig. 7, that the part 196' is rigidly secured to the shaft 45 while the part 196 is free to turn relative to the shaft, These two parts are connected together by an eccentric connection 202 which can be adjusted to bring the rods 185 and 186 to a condition of exact parallelism with each other.

When the bails including the bail rods 185 and 136 are rocked in a direction to move the rods 185 and 186 away from each other, these rods bear against the shoulder formations 187 and 18.8 of the corresponding positive and negative tens-transfer levers 70 and 130 and move these levers outwardly about their pivotal mountings on the sleeves ti) and 41 to bring the live point arms 96 and 152. back under the latch lever abutments 106 and 155 to relatch the tens-transfer levers in inoperative condition. When the rods 185 and 186 are moved toward each other the tens-transfer levers are freed to be rocked about the sleeves it? and 5-1 by the corresponding springs 85 and 182 after the levers have been unlatched by tens-transferring rotations of the coordinal accumulator gears.

The bail legs 3% and 1% are secured to the shaft 45 by pinned hubs 2M and the rod 186 is secured to these legs by similar pinned hubs 295 and the side plates 17 and 118 of the machine are provided with registering apertures 2% through which the rod 136 extends. The bail rod 185 is also secured to the legs 1% and 1531 by pinned hubs 2%7, similar to the hubs ZtiS.

The shaft 42 is extended outwardly at its right-hand end beyond the right-hand end of the shaft 45 and a lever arm 2% is rigidly secured at one end to the right-hand end of the shaft 45 and projects rearwardly from this shaft.

A tens-carry actuating bellcrank lever, generally indicated at 2%, is pivotally mounted at one end on a fixed pivot provided by a shaft or stud 211 disposed rearwardly of the accumulator mechanism and has an arm 212 extending upwardly and forwardly from the shaft 211 and a second arm 214 extending upwardly and rearwardly from the distal end of the arm 212 with the center lines of the arms 212 and 21 i substantially perpendicular to each other. At its upper end the arm 214 carries a cam following roller 2l5 which rides on the peripheral edge of a tens-carry cam 216 rigidly mounted on the main drive shaft 218 of the machine. The cam 216 has an intermediate or lobe portion 220 of substantially circular shape concentric with the axis of the shaft 218, a high point or peak 221 at one end of the intermediate portion and a dwell 222 disposed between the peak 221 and the other end of the intermediate or lobe portion 22%. It will be noted from an inspection of Fig. 1, that the intermediate portion 220 occupies the major part of the circumference of the cam while the peak or high point 221 and the dwell 222 are of restricted angular extent.

An apertured ear formation 224 is formed on the distal end of the arm 212 of the bellcrank lever 21b and an adjustable length link 225 connects this ear formation to the free or distal end of the lever arm 203.

The operation of the mechanism is such that when the associated machine completes an operating cycle, the roller 215 is left in the dwell 222 of the actuating cam 216, this constituting the full-cycle condition of the machine. When the roller 215 is in the cam dwell the lever 219 is rocked downwardly, rocking the lever arm 298 downwardly and swinging the bail rods 185 and 186 to their limiting position toward each other, thereby leaving any of the unlatched tens-transfer levers 76 or 133 in the position occupied by these levers after such levers have completed their tens-transfer function. Shortly after the beginning of a subsequent operating cycle of the machine, the roller 215 rides up onto the peak 221 of the cam 216 thereby swinging the lever 214 upwardly to its limiting upper position and raising the lever arm 298 correspondingly. This moves the bail rods 185 and 186 to their limiting position away from each other, and swings the tens-transfer levers 70 and 13d outwardly until any unlatched tens-transfer levers are relatched by the corresponding latch levers lot or 153. During the digitation portion of the machine cycle and before any values are entered into the machine accumulator, the roller 215 rides off the high point or peak 221 onto the lobe or intermediate portion 220 of the cam, thereby lowering the bellcrank lever 210 and the lever arm 208 a predetermined amount to space the bail rods 185 and 186 a distance from the corresponding tens-transfer lever shoulders 187 and 188 a distance such that an unlatched tenstransfer lever can be moved by its spring or 182 to a position at which it cannot he accidentally relatched but at which the corresponding shoe 91 or 14% cannot engage the coordinal accumulator gear &7. A short time before the end of the cycle the roller 215 drops into the dwell 222 of the cam 16 thereby further lowering the bellcrank lever 210 and the lever arm 2% and moving the bail rods 1555 and 1&6 toward each other to an extent such that any unlatched tens-transfer levers 7-9 or 136 are freed for movement by their associated springs $5 or 132 to complete the tens-transfer operations which were set up by the unlatching of the levers.

A zero stop bail 225 is pivotally mounted on the shaft 97 and has a cross-member extending through registering a ertures, as indicated at 22-5, in the side plates 1'7 and 13 of the machine, and disposed immediately above the cam formations 3.26 of the live tips 114- of the positive latch lovers 1431. This bail has a position in which it is entirely clear of the cam formations 126 and a second posi tion in which it engages these cam formations and restrains the live tips against movement to permit the ends of the tens-transfer cams 51 to pass the live tips. When the bail 225 is in the second position all of the accumulator gears 47 can be rotated back to and stopped at their zero position, thus rendering it possible to extract a total from the accumulator.

A similar zero stop or total taking bail 223 is mounted on the shaft 154 and is movable into and out of engagement with the cam formations to? on the negative latch levers 153 to render it possible to condition the accu mulator for the extraction of a negative total therefrom.

A rectangular frame 23d is mounted on the flat shoulders provided by the straight upper edges of the side and spacer plates of the accumulator at the lower ends of the plate extensions 55 and is held in place on the upper portion of the accumulator by tension springs, as indicated at 231, connected between the frame at its midlength location and the corresponding ends of the stop rod 95. This top frame is provided at its front and rear edges with downwardly directed flanges 232 and 234 which are provided with spaced apart notches receiving the upper edges of the side and spacer plates of the mechanism to hold the upper edges of these plates in properly spaced and parallel relationship to each other.

While the accumulator mechanism shown in the accompanying drawings and hereinabove described is similar in construction and operation to the accumulator mechanism disclosed in my copending application, S. N. 509,- 022, filed May 17, 1955, for Calculating Machine, it embodies numerous structural improvements which greatly facilitate the operating efficiency and improve the structural rigidity and the durability of the mechanism.

The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiment is, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are, therefore, intended to be embraced therein.

What is claimed is:

l. A calculating machine accumulator comprising a base, a pair of side plates disposed perpendicular to said base and in parallel relationship to each other, separator plates uniformly spaced apart between said side plates in spaced apart relationship to the latter, means rigidly securing said side plates and separator plates to said base, a pair of sleeves extending through said separator plates adjacent said base and in spaced apart and parallel relationship to each other, bail shafts extending one through each of said sleeves and through said side plates, an accumulator gear shaft extending through said side and separator plates in spaced and parallel relationship to said sleeves, accumulator gears mounted on said accumulator gear shaft and disposed one in each ordinal space between said plates, a tens-transfer cam on each accumulator gear, a drive gear shaft extending through said plates in spaced and parallel relatinship to said accumulator gear shaft, drive gears mounted on said drive gear shaft, one in each ordinal space between adjacent plates and meshing with the coordinal accumulator gears, positive tens-transfer levers mounted on one of said sleeves one in each ordinal space between adjacent plates and spring-urged in a direction to impart tens-transfer movements to the coordinal accumulator gears, negative tens-transfer levers mounted on the other of said sleeves one in each ordinal space between adjacent plates and spring-urged in a direction to impart tens-transfer movements to the coordinal accumulator gears, latch lever shafts extending through said plates at respectively opposite sides of said accumulator gear shaft and in spaced and parallel relationship to the latter, positive latch levers mounted on one of said latch lever shafts one in each ordinal space between adjacent plates and springurged to position to engage the corresponding positive tens-transfer levers and individually latch the tens-transfer levers in inoperative position, negative latch levers mounted on the other of said latch lever shafts one in each ordinal space between adjacent plates and spring-urged to position to latch the corresponding negative tens-transfer levers in inoperative position, cach latch lever engaging a tens-transfer lever of the next higher order and said latch levers being moved to release the tens-transfer levers by the tens-transfer cams on the coordinal accumulator gears when the accumulator gears are turned through ten unit spaces from their 0 positions, a bail mounted on each of said bail shafts and respectively effective to restore said positive and negative tens-transfer levers from their gear engaging to their latched positions, and a power driven cam connected to said bails to operate said bails in a predetermined manner during each operating cycle of the associated calculating machine.

2. In a calculating machine accumulator having a set of ordinally arranged accumulator gears, a set of ordinally arranged positive tens-transfer levers spring-urged in a direction to impart tens-transfer movements to said accumulator gears, a set of positive latch levers springurged to position to latch said positive tens-transfer levers in inoperative position, a set of negative tens-transfer levers ordinally arranged and spring-urged in a direction to impart tens-tranfer movements to said accumulator gears, a set of ordinally arranged negative latch levers spring-urged to position to latch said negative tens-transfer levers in inoperative position, and tens-transfer cams carried one by each accumulator gear and effective when the accumulator gears are turning in a positive direction to selectively move the positive latch levers to position to release the positive tens-transfer levers and when the accumulator gears are turning in a negative direction to selectively move the negative latch levers to position to release the negative tens-transfer levers, a positive restore bail engaging said positive tens-transfer levers and effective when rocked to restore any released positive tens-transfer levers to latched condition, a negative restore bail engaging said negative tens-transfer levers and effective when rocked to restore any unlatched negative tens-transfer levers to latched condition, and power operated means connected to said bails for rocking the latter.

3. In a calculating machine accumulator having a set of ordinally arranged accumulator gears, a set of ordinally arranged positive ten-stransfer levers spring-urged in a direction to impart tens-transfer movements to said accumulator gears, a set of positive latch levers springurged to position to individually latch said positive tenstransfer levers in inoperative position, a set of negative tens-transfer levers ordinally arranged and spring-urged in a direction to impart tens-transfer movements to said i0 accumulator gears, a set of ordinally arranged negative latch levers spring-urged to position to individually latch said negative tens-transfer levers in inoperative position, and tens-transfer cams carried one by each accumulator gear and effective when the accumulator gears are turning in a positive direction to selectively move the positive latch levers to position to release the positive tens-transfer levers and when the accumulator gears are turning in a negative direction to selectively move the negative latch levers to position to release the negative tens-transfer levers, a positive restore bail engaging said positive tenstransfer levers and effective when rocked to res-tore any released positive tens-transfer levers to latched condition, a negative restore bail engaging said negative tens-transfer levers and effective when rocked to restore any unlatched negative tens-transfer levers to latched condition, power operated means connected to said bails for rocking the latter, and means interconnecting said bails to constrain simultaneous and coextensive rocking movements thereof.

4. In a calculating machine accumulator having a set of ordinally arranged accumulator gears, a set of ordinally arranged positive tens-transfer levers spring-urged in a direction to impart tens-transfer movements to said accumulator gears, a set of positive latch levers springurged to position to latch said positive tens-transfer levers in inoperative position, a set of negative tens-transfer levers ordinally arranged and spring-urged in a direction to impart tens-transfer movements to said accumulator gears, a set of ordinally arranged negative latch levers spring-urged to position to latch said negative tens-transfer levers in inoperative position, and tens-transfer cams carried one by each accumulator gear and effective when the accumulator gears are turning in a positive direction to selectively move the positive latch levers to position to release the positive tens-transfer levers and when the accumulator gears are turning in a negative direction to selectively move the negative latch levers to position to release the negative tens transfer levers, a positive restore bail engaging said positive tens-transfer levers and effective when rocked to restore any released positive tenstransfer levers to latched condition, a negative restore bail engaging said negative tens-transfer levers and effective when rocked to restore any unlatched negative tenstransfer levers to latched condition, and power operated means connected to said bails for rocking the latter, each of said tens-transfer levers comprising a bellcrank lever rockably mounted intermediate its length on a fixed support and having spaced apart spring hooks at one end thereof, a live tip pivotally mounted on said bellcrank lever near the other end of the latter and having four angularly spaced apart arms, one of which functions as a stop arm engageable with a limit stop limiting turning movements of the live tip relative to the bellcrank lever, a second of which functions as a spring hook, a third as a latch engaging arm and the fourth as an accumulator gear engaging arm, and a spring connected between one of the spring hooks on said bellcrank lever and the spring hook arm on said live tip and resiliently urging said live tip to a position in which the stop arm thereof is against the associated limit stop.

5. In a calculating machine accumulator having a set of ordinally arranged accumulator gears, a set of ordinally arranged positive tens-transfer levers spring-urged in a direction to impart tens-transfer movements to said accumulator gears, a set of positive latch levers springurged to position to latch said positive tens-transfer levers in inoperative position, a set of negative tens-transfer levers ordinally arranged and spring-urged in a direction to impart tens-transfer movements to said accumulator gears, a set of ordinally arranged negative latch levers spring-urged to position to latch said negative tenstransfer levers in inoperative position, and tens-trans fer cams carried one by each accumulator gear and effective when the accumulator gears are turning in a positive direction to selectively move the positive latch levers to position to release the positive tens-transfer levers and when the accumulator gears are turning in a negative direction to selectively move the negative latch levers to position to release the negative tens-transfer levers, a positive restore bail engaging said positive tenstransfer levers and efiective When rocked to restore any released positive tens-transfer levers to latched condition, a negative restore bail engaging said negative tenstransfer levers and effective when rocked to restore any unlatched negative tens transfer levers to latched condition, and power operated means connected to said bails for rocking the latter, each of said latch levers comprising a lever arm swingably mounted at one end on a fixed support and having at its free end an abutment formation and a spring hook adjacent said abutment formation, a live tip pivotally mounted on said lever arm and having three angularly spaced apart arms of which one functions as a limit stop arm, a second as a spring hook and the third as a transfer cam engaging arm, a first spring connected between said live tip spring hook arm and said latch lever urging said live tip to an angular position relative to said latch lever as predetermined by said limit stop arm, and a second spring connected between the spring hook on said latch lever arm and a fixed support urging said latch lever to latching position relative to an associated tens-transfer lever.

6. In a calculating machine accumulator having ordinally arranged accumulator gears, a tens-transfer cam rotatable with each gear, positive and negative latch levers coordinal With said gears and engageable by said tens-transfer cams, and positive and negative tens-transer levers spring-urged into tens-transfer engagement With said gears and normally latched in inoperative position by the corresponding latch levers, positive and negative restore bails respectively engageable with said positive and negative tens-transfer levers to restore unlatched levers to latched condition.

7. In a calculating machine accumulator having ordinally arranged accumulator gears, a tens-transfer cam rotatable with each gear, positive and negative latch levers coordinal with said gears and engageable by said tens-transfer cams, and positive and negative tens-transfer levers spring-urged into tens-transfer engagement With said gears and normally latched in inoperative position by the corresponding latch levers, positive and negative restore bails respectively engageable with said positive and negative tens-transfer levers to restore unlatched levers to latched condition, said restore hails being normally held in an intermediate position at which they stop unlatched tens-transfer levers at a position at Which the unlatched tens-transfer levers cannot be accidentally rclatched out at which they are held out of tens-transfer engagement with the corresponding accumulator gears.

8. In a calculating machine accumulator having ordinally arranged accumulator gears, a tens-transfer cam rotatable with each gear, positive and negative latch levers coordinal with said gears and engageable by said tens-transfer cams, and positive and negative tens-transfer levers spring-urged into tens-transfer engagement with said gears and normally latched in inoperative position by the corresponding latch levers, positive and negative restore bails respectively engageable with said positive and negative tens-transfer levers to restore unlatched levers to latched condition, said bails being disposed in spaced apart and parallel relationship to each other and each including a rock shaft, a bail rod parallel to said real; shaft, and bail legs interconnecting said bail rod and rock shaft at the ends of said shafts, one of said rock shafts being extended at one end beyond the associated bail leg, and a lever arm secured to said one end of said one rock shaft for rocking said bails.

9. In a calculating machine accumulator, a deformable base, ordinally spaced plates upstanding from said base in parallel relationship to each other, sleeves extending through registering apertures in said plates in spaced apart and parallel relationship to each other, tenstransfer levers rockably mounted on said sleeves one between each two adjacent plates, and tens-transfer lever restore bails each having a rock shaft extending through and rockable in a corresponding one of said sleeves.

References Cited in the file of this patent UNITED STATES PATENTS 1,774,289 Pasinski Aug. 26, 1930 FOREIGN PATENTS 346,478 Germany Ian. 2, 1922 

